农业工程学报2012，Vol.28Issue(4)：169-174,6.DOI:10.3969/j.issn.1002-6819.2012.04.028
基于虚拟仪器的果树重叠叶片LAI实时检测系统
Real-time detection system for LAI of fruiter overlapped leaves based on virtual instruments
摘要
Abstract
At present, distinguishing overlapped leaves is the difficulty of measuring LAH leaf area index). In this paper, a new method for the detection of LAI of overlapped leaves was proposed. The citrus leaves were put under the direct parallel light and the photoelectric sensor was used to measure the transmitted light energy. The output voltage signal of the sensor was sent into the computer through the data acquisition card. Then, the amount of overlapped layers was determined automatically by Lab VIEW software programming. The amount of overlapped layers multiplied by the area of the sensor receiver was the area of the leaves. The total area of the leaves was the cumulative leaf area in the whole testing process and the LAI could be calculated. According to the experimental results, near-infrared was chosen as the photosource and a near-infrared photoelectric sensor was designed. The short circuit current I1 and I2 had a good linear relationship with the preamplifiers output voltage U\ and the main output voltage U2. The significant level of R2 was p<0.05. The data acquisition experimental results showed that the absolute value of the maximum relative error between the value of LAI calculated by this platform and the real value of LAI obtained by grid method was 14.8%, in the mode of manual scanning. Moreover, the LAI with distant leaves was tested in preliminary stage showing a power function with the leaf distance significantly.关键词
传感器/检测/光学测量/叶面积指数/重叠叶片/虚拟仪器Key words
sensors/ testing/ optical variables measurement/ leaf area index/ overlapped leaves/ virtual instruments分类
农业科技引用本文复制引用
吴伟斌,洪添胜,朱余清,代芬,李东东,张立俊..基于虚拟仪器的果树重叠叶片LAI实时检测系统[J].农业工程学报,2012,28(4):169-174,6.基金项目
国家自然科学基金(30871450)、现代农业产业技术体系建设专项资金(农科教发[2011]13号)和国家公益性行业(农业)科研专项经费(200903023)项目资助 （30871450）
